Dos bloques de masa m1= 5kg y m2=2kg, con m1 > m2 , se colocan en contacto mutuo sobre una superficie horizontal sin fricción, como se muestra en la figura. Una fuerza horizontal constante F= 23 N. Se aplica a la m1 como se muestra. A) Encuentre la magnitud de la aceleración del sistema.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.